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A motorcycle has a constant speed of 28.0 m/s as it passes over the top of a hill whose radius of curvature is 109 m. The mass of the motorcycle and driver is 348 kg. Find the magnitude of the norma
The rotational inertia of a collapsing spinning star changes to 3/4 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy (KEnew / KEi)?
You throw a snowball at an angle of 28.0° below the horizontal from the roof of a building that is 91.0 m above flat ground. The snowball hits the ground a distance of 44.0 m from the base of th
The coefficient of static friction between the table and te block is .465 and the coefficient of kinetic friction between the tabel and the block is .320. Sand is gradually added to the bucket until
Which makes the pendulum swing upward in an arc. Determine the horizontal component of the pendulum's displacement.
A plate carries a charge of -3.7 µC, while a rod carries a charge of +1.9 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
The box has a mass of 31.0 kg, and the coefficient of kinetic friction between the box and floor is 0.530. The acceleration of gravity is 9.81 m/s2 . What is the acceleration of the box?
A 4.0 kg pendulum stars at a height of 1.50 m. partway through ts downward swing it reaches a velocity of 3.0 m/s. what is the hieght of the pendulum at this velocity?
Path A is 7.0 km long heading 60.0° north of east. Path B is 6.0 km long in a direction due east. Path C is 3.0 km long heading 315° counterclockwise from east. (a) Graphically add the hiker
A toy train is pushed forward and released at = 4.0 with a speed of 2.5 . It rolls at a steady speed for 3.0 , then one wheel begins to stick. The train comes to a stop 9.4 from the point at which i
A 65.0 kg base runner begins his slide into second base when moving at a speed of 4.2 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero jus
A total resistance of 3.0ohms is to be produced by combining an unknown resistor R with a 12 ohm resistor. what is the value of R and how is it to be connected to the 12 ohm resistor.
A 0.50 kg mass hangs from a string which is attached to a 1 kg box. The coefficient of friction between the box and the table top is 0.12. When the hanging mass is allowed to fall freely, the system
In a physics lab experiment a student immersed 200 onecent coins (each having a mass of 3.00 g) in boiling water. After they reached thermal equilibrium, she fished them out and dropped them into 0.
Neglect air resitance. Find rocket's kinetic energy when the rocket is 1000 km above Earth's surface
What is the maximum amplitude with which the end of the board can vibrate in order that a pebble placed there will not lose contact with the board during the oscillation?
A uniform electric field of magnitude 355 N/C pointing in the positive x-direction actos on an electron, which is initially at rest. The electron has moved 3.40 cm.
A 0.450-kg ball is dropped from rest at a point 1.30 m above the floor. The ball rebounds straight upward to a height of 0.700 m. What are the magnitude and direction of the impulse of the net force
The intensity of a particular earthquake wave is measured to be 4.0 106 J/m2·s at a distance of 49 km from the source. What was the intensity when it passed a point only 7.0 km from the source?
You are given a vector in the xy plane that has a magnitude of 84.0 units and a y component of -53.0 units. What are the two possibilities for its x component?
You fire a gun horizontally that is 25.0 m off the ground and the bullet goes at 200.0 m/s. What is the time it takes for the bullet to hit the ground, how far down range does the bullet travel, and
The bright fringes are found to be separated by a distance of 0.1 mm. Planck's constant is 6.63 × 10 -34 J · s. What is the kinetic energy of the electrons in the beam? Answer in units of
Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped
Water in a 0.310 kg iron pot initially at 19.3oC. If the final equilibrium temperature is 24.8oC, calculate the initial temperature of the hot horseshoe.
The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting